The Act of the Re-Establishment of the State of Lithuania or Act of March 11 (Lithuanian: Aktas dėl Lietuvos nepriklausomos valstybės atstatymo) was an independence declaration by Lithuania adopted on March 11, 1990, signed by all members of the Supreme Council of the Republic of Lithuania led by Sąjūdis. The act emphasized restoration and legal continuity of the interwar-period Lithuania, which was occupied by the Soviet Union and lost independence in June 1940. It was the first Soviet republic of the 15 Soviet republics to declare independence from the Soviet Union. The other 14 Soviet republics would later declare their independence. These events would cause the dissolution of the Soviet Union in 1991.